Warp-stopping mechanism for looms



Sept. 24, 1929. w. NOYES WARP STOPPING MECIIANISM FOR LOOMS Filed Dec. 21, 1928 l/ENTOFP/ ATTORNEY Patented Sept. 24, 1929 UNITED STATES PATENT OFFICE IRA W. NOYES, OF HOPEDALE, MASSACHUSETTS, ASSIGNOR TO DRAPER CORPORATION, OF HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE WARP-STOPPING MECHANISM FOR LOOMS Application filed. December 21, 1928.

This invention relates to warp stop mechanism for looms and is more particularly directed to the connections between the warp fault detector mechanism and the actuator therefor.

It is now the ordinary practice to provide looms with warp stop mechanism to bring the loom to rest on the occurrence of a warp fault, and such mechanism usually comprises a detector mechanism and an actuator therefor to impart to the detector mechanism the detecting movements.

In the train of devices for actuating the detector mechanism there is usually employed an oscillator arm which is connected to an actuator to impart oscillating movements to the arm. The connection between. the oscillator and the actuator has usually comprised a block pivotally mounted on the oscillator and having a bearing engaged by a laterally extending or bent end of the actuator. During the loom operation, however, the oscillator has not only its oscillating movement but that movement is in an arcuate path, with the result that the end of the actuator not only rocks in the bearing of the block but has a tendency for endwise movement particularly in a direction inward of the block hearing. The effect of this has been to impart an undesirable amount of wear and binding effect between the lateral bend at the end portion of the actuator and the block bearing, resulting in lost motion which may be manifested in improper amount of movement imparted to the warp fault detector mechanism and finally in its improper operation.

The object of the present invention, therefore, is to provide a connection between the oscillator and its actuator which will overcome these objections and prevent undue endwise movement of the end of the actuator laterally into the bearing of the block and preserve accurate detecting movements of the warp fault detecting mechanism.

The invention and new combination of parts will best be made clear from the following description and the accompanying drawirgs of one good practical embodiment there- Serial No. 327,598.

In the drawings:

Fig. 1 is a perspective view of a portion of a warp stop mechanism containing the present invention;

Fig. 2 is a detail sectional elevation showing the connection between the oscillator and its actuator; and

Fig. 3 is a section through the lower or cam shaft and showing the connection between the oscillator and actuator in elevation.

In the present illustration of the invention the warp stop mechanism is shown as of the transversely movable detector bar type and comprises the end brackets 1, one at each side of the loom, between which extend fixed toothed detector bars 2, each of which has associated with it a movable toothed detector bar 3, and extending between the side brackets 1 are the warp supports 4. The warp threads a normally support the drop wires 5 during weaving and on the occurrence of a warp fault the released drop wire effects loom stoppage, as usual.

Connected to each of the movable detector bars 3 is a link 6 operativcly associated with the fingers 7 which are supported upon and adapted to yield on the rocker or rockers 8. The rockers 8 are mounted on the rock shaft 9 to which is secured the oscillator 10 as by means of the set screw 11.

As usual in warp stop mechanisms of the type shown, the oscillator 10 and perforce the warp fault detecting mechanism is operated from a lower or cam shaft 12 provided with cams 13 and 14-. adapted to raise and lower a 35 yoke 15 that is secured to the lower end of the actuator 16. The yoke 15 has downwardly eX- tending prongs 17 which straddle the shaft 12, and a pivoted switch 18 determines the course of the cam control. The parts so far described may all be as more fully shown and described in the patent to Harry A. Davis, No. 1,687,471, dated October 9, 1928.

Pivotally mounted on the oscillator 10 is a block 19 provided with a bearing into which extends the bent end 20 of the actuator 16, and a cotter pin 20 serves to prevent disengagement of the actuator from the block hearing. The block 19 may be conveniently associated with the oscillator 10 by the pivotal connection 21 and may be adjusted to different positions relative to the oscillator by means of the slot 22.

During normal weaving operations the oscillator 10 has imparted to it a movement in a vertical direction in an arouate path and the bent end 20 of the actuator may freely rock in the block bearing. Owing to the arcuate movement of the block during the rising and falling movement of the oscillator, the laterally extending end portion 20 of the actuator 16 tends to movement longitudinally inward of the block bearing, with the result that the bend at 16 of the actuator may bind upon the exterior surface of the block bearing and cause excessive wear which even tu ally is reflected in improper detecting move ments of the warp fault detecting mechanism.

In accordance with the present'invention, the block 19 is provided with an offset portion 24 in opposed relation with the block bearing,

and in the offset portion 24. of the block 19 there is a stop which abuts against the terminal end of the laterally extending portion of the actuator. Such stop may be variously contrived, but in the present instance it is formed by a pin 23 threaded into the offset portion 24 and consequently adjustable to determine the extent of inward movement of the end portion 20 of the actuator relative to the block bearing. a

Owing to the offset portion 24, a space is provided between the offset portion and the block bearing for manipulation of the cotter pin 20*.

From the construction described as a good practical form of the present invention, it will be obvious that the bent end'portion 20 of the actuator is prevented from longitudinal movement-inward of the block bearing, with the result that 'the bend of 16 is prevented from contacting with the exterior surface of the bearing and all wear and lost motion previously apparent at this point is avoided with consequent accuracy in the detecting movement of the warp fault detecting mechanism.

What is claimed is:

1. In a warp stop mechanism for looms, the combination of warp fault detector mechanism, an oscillator arm for operating said mechanism, an actuator for saidarm having a laterally extending portion, and connections between the oscillator arm-and actuator including a block pivotally connected to the r oscillator arm and having a bearing to receive the laterally extending portion of the actuator, and an off-set portion on said bloc-k opposite the terminal end of the actuator, a stop mounted on the offset portion of the block and abutting against the terminal end of the laterally extending portion of the actuator to limit inward movement thereof into the bearing of the block and preserve proper detecting movement of the detector mechanism.

2. In a warp stop mechanism for looms, the combination of warp fault detector mechanism, an oscillator arm for operating said mechanism, an actuator for said arm having a laterally extending portion, and connections between the oscillator arm and actuator including a block pivotally connected to the oscillator arm and having a bearing to receive the laterally extending portion of the actuator and an opposed off-set portion, extending parallel to the bearing portion of the block and separated therefrom, an adjustable stop mounted in the off-set portion of the block and abutting against the terminal end of the laterally extending portion of the actuator to limit the longitudinal inward movement thereof into the bearing of the block.

3. In a warp stop mechanism for looms, the con'ibination of transversely movable detector bars, an oscillator arm, operating connections between the arm and the movable detector bars, an actuator for said arm having a lateral bend and connections between a the actuator and arm including a block pivotally connccted to the oscillator arm and having a bearingto receive the bent end of the actuator, and a stop mounted on the block in separated relation with the actuator bearing and abutting against the terminal endof the lateral bend to limit inward-movement of the bentend into the bearing of the block.

h In a warp stop mechanism for looms, the combination of transversely movable detector bars, an oscillator arm, operating connections between the arm and the movable detector bars, an actuator for said arm having a lateral bend and connections between the actuator and arm including a block pivotally connected to the oscillator arm and having a bearing to receive the bent end of the actuator, an off-set portion of the block opposed to the bearing, and a stop adjustably threaded in said off-set portion and bearing'against the terminal end of the bent portion of the actuator.

In testimony whereof, I have signed my name to this specification.

IRA w. NOYES. 

